Graphite-Embedded Self-Lubricating Bronze Bushings for High-Precision Cold Rolling Mills
Graphite-Embedded Self-Lubricating Bronze Bushings for High-Precision Cold Rolling Mills
High-Performance Self-Lubricating Bronze Bushing Solutions & Technologies. Minimize downtime, extend service life, and reduce costs for dynamic applications.
Graphite-Embedded Self-Lubricating Bronze Bushings for High-Precision Cold Rolling Mills
In modern cold rolling mills—whether 4-Hi, 6-Hi, 20-Hi Sendzimir, CVC, HC, or UCM—precision and stability are paramount. To achieve perfect flatness, crown control, edge drop management, and superior surface quality for automotive panels, appliance sheets, tinplate, or silicon steel, every moving component must maintain micron-level accuracy under heavy loads, low speeds, and harsh emulsion environments.
In cold rolling mills, precision and reliability are essential. Steel sheets undergo careful thinning and strengthening to meet exact specifications. VIIPLUS offers a wide range of solutions, including bronze plate, bronze liner, sleeve bushings, and graphite-plug block and bronze liners, all designed to ensure optimal performance and accuracy. Our expertise also extends to critical operations such as welder centering and coil joint welding, highlighting our comprehensive approach to supporting the cold rolling industry.
Graphite-embedded self-lubricating bronze bushings—also called solid lubricant bronze bearings, oilless bushings, or graphite-plugged bronze sleeves—have become the top choice for steel mills and global cold rolling lines.
Key Applications in Cold Rolling Mills
| No. | Location | Function | Typical Load & Movement |
|---|---|---|---|
| 1 | Work roll / Intermediate roll bending blocks | Positive & negative bending, board shape control | High-frequency micro stroke, 80–150 MPa |
| 2 | Support roll hydraulic balance cylinder | Upper/lower floating balance | Heavy load, slow speed, continuous operation |
| 3 | Axial shifting (roll shifting) device | Intermediate roll axial movement | Frequent reciprocating, iron powder environment |
| 4 | AGC screw-down nut & worm gear box | Precise thickness control | Rotation + micro floating |
| 5 | Roll change rails and pushing device | Fast roll change carriage guidance | Impact + sliding under coolant |
| 6 | Hydraulic cylinder hinge pins | Bending, balancing, pressing cylinders | Alternating load, swing motion |
| 7 | Segmented cooling beam lifting & swing | Cooling control | Small stroke, water + emulsion |
Recommended Materials for Cold Rolling Mill Applications
| Material Grade | Base Alloy | Lubricant & Content | Hardness HB | Max Pressure | Ideal Position | Key Advantages |
|---|---|---|---|---|---|---|
| JDB-10 (CuZn25Al5 + Graphite) | ZCuZn25Al6Fe3Mn3 | High-purity graphite 8–12% | 210–250 | 150 MPa | Bending block, shifting, balance (most popular) | Excellent cost-performance; widely used by Baosteel & Shougang |
| JDB-20 (CuAl10Ni5Fe4 + Graphite) | ZCuAl10Fe3Mn2 | Graphite + MoS₂ | 180–220 | 120 MPa | High-load bending, screw-down nut | Outstanding corrosion resistance in acidic emulsions |
| JDB-50 (CuSn12 + Graphite + PTFE) | Tin / Phosphor bronze | Graphite + PTFE layer | 130–180 | 80 MPa | Roll change rails, cooling beam | Superior impact resistance; long service life in wet environments |
| C86300 / 650# Manganese Bronze | High-strength manganese bronze | Ultra-dense graphite | 230–280 | 200 MPa | 20-Hi Sendzimir saddle, ultra-heavy load | Preferred for stainless & silicon steel mills |
| CuZn25Al5 + PTFE surface layer | ZCuZn25Al6Fe3Mn3 | 0.5 mm PTFE + graphite top layer | ~210 | 120 MPa | Ultra-high flatness automotive outer panel | Starting friction ≤0.03; extreme precision |
Proven Performance in Steel Mills
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CuZn25Al5 graphite bushings for all bending blocks (wall thickness 20–35 mm)
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– C86300 graphite bushings on support roll balance, serving over 6 years without replacement
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– CuAl10Ni + graphite + MoS₂ shifting sleeves, service life exceeding 5 years
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C86300/650# manganese bronze graphite bushings
Why Graphite Bronze Bushings Are Preferred in Cold Rolling Mills
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Maintenance-free operation – No oil or grease required for 3–8 years
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Ultra-low friction – Starting friction can be as low as 0.03 with PTFE layer
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High wear resistance – Performs reliably under low-speed, heavy-load oscillation
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Chemical resilience – Resistant to emulsion, coolant, iron scale, and oxide powders
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Long-term precision – Maintains 0.01–0.03 mm clearance for years, ensuring perfect board shape
Trusted Solution for All Cold Rolling Mills
For 4-Hi, 6-Hi, CVC, HC, UCM, or 20-Hi Sendzimir mills, the standard, trusted setup includes:
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Base material: ZCuZn25Al6Fe3Mn3 (CuZn25Al5)
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Solid lubricant: 8–12% high-purity graphite plugs, with optional PTFE surface coating
Need exact part drawings, tolerance recommendations (H7/g6, H7/f7), graphite pattern designs, or customized samples? Contact us today. We supply the same high-performance graphite bronze bushings trusted by China’s top steel producers and global cold rolling projects.
Keywords: graphite bronze bushing cold rolling mill, self-lubricating bearing steel industry, oilless bush cold roll, JDB graphite plugged bronze, CuZn25Al5 graphite sleeve, Sendzimir mill bearing, roll bending block bushing, AGC screwdown bronze nut liner, maintenance-free bearing cold rolling
Metal Bushing (Lubricated Metal) -Self-Lubricating Bushing Materials
Bushings are specialized, self-lubricating metal components widely utilized across various industries due to their durability and low maintenance requirements. Self-lubricating metal bushings are engineered to function without additional lubrication in numerous applications, thereby minimizing maintenance needs. These bushings are available in various series and configurations, such as flanged bushings and split bearings, to meet specific application requirements.
Metal-Polymer Anti-Friction Plain Bearings
Metal-Polymer Composite Self-lubricating Bushing Material
Steel Back + Porous Bronze Sinter + PTFE
